ICD-10-CM 2027
ICD-10 code for breast x-ray
Encounter for screening mammogram for malignant neoplasm of breast
From the official ICD-10-CM alphabetic index entry “X-ray (of) › breast (mammogram) (routine)”. Page updated September 29, 2026.
About coding breast x-ray
The ICD-10-CM code for breast x-ray is Z12.31 (Encounter for screening mammogram for malignant neoplasm of breast).
Within Z12.3 (encounter for screening for malignant neoplasm of breast), Z12.31 is specifically for encounter for screening mammogram for malignant neoplasm of breast. Related codes cover other screening for malignant neoplasm of breast (Z12.39).
Don't report Z12.31 together with the conditions in its Excludes1 note: inconclusive mammogram (R92.2).
Use an additional code to identify any family history of malignant neoplasm (Z80.-).
Don't confuse with (Excludes1 for Z12.31)
- inconclusive mammogram (R92.2)
Common questions about breast x-ray ICD-10 codes
What is the ICD-10 code for breast x-ray?
- Z12.31 — Encounter for screening mammogram for malignant neoplasm of breast.
Is Z12.31 billable?
- Yes. Z12.31 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Z12.31 be used as a principal diagnosis?
- No. It is not acceptable as the principal diagnosis for an inpatient stay; it may be reported as a secondary diagnosis.
Is Z12.31 a CC or MCC?
- No. Z12.31 is neither a CC nor an MCC under MS-DRG v44.0.